Yann Arthus-Bertrand's many books include the multimillion-copy international bestseller Earth from Above. His aerial photographs have been featured in National Geographic, Life, and Sierra, among other magazines. He lives in France. An agronomist and writer specializing in the environment and society, Isabelle Delannoy is the author of a number of books and has worked with Yann on several occasions. She blogs about sustainable development at www.echos.com.